#include<stdio.h>
int main()
{
    void copy(char [ ],char[ ]);
    char s1[10],s2[10];
    printf("请输入一段英文字母\n");
    scanf("%s",s1);
    copy(s1,s2);
    printf("这个字符串里面的小写元音字母是%s\n",s2);
    return 0;

}
void copy(char s1[ ],char s2[ ])
{
    int i,j;
    for(i=0,j=0;s1[i]!='\0';i++)
    {
        if(s1[i]=='a'||s1[i]=='e'||s1[i]=='i'||s1[i]=='o'||s1[i]=='u')
        s2[j]=s1[i];
        j++;
    }
    s1[j]='\0';
}